Dissertation / PhD Thesis

FZJ-2014-06452

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png High Temperature Corrosion of Alloys and Coatings in Gas-Turbines Fired With Hydrogen-Rich Syngas Fuels

Nowak, W. (Corresponding Author)FZJ*

2014
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag Jülich
ISBN: 978-3-95806-012-8

Please use a persistent id in citations: http://hdl.handle.net/2128/8415

Abstract: One of the possible ways to reduce the CO$_{2}$ emissions from coal fired power plants is to use a H$_{2}$-rich syngas in the gas turbine as a fuel which is realized in the Integrated Gasification Combined Cycle (IGCC). However, burning syngas results in higher amount of water vapourin the turbine environment compared to the turbines operating on e.g. natural gas. In the present studies the effect of water vapour on the oxidation behaviour of three materialgroups used in stationary gas turbines was investigated, including: 1. A polycrystalline Ni-base superalloy Rene 80, which is representative of a chromia forming alloys; 2. An alumina forming, Re-containing MCrAlY coating, and 3. APS-TBC systems based on Rene 80 and having the same MCrAlY as the bondcoat. The three materials types were tested mainly at 1050°C, however, some experiments were also performed at higher temperatures: 1080°C and 1120°C in various atmospheres including those based on Ar-O$_{2}$ and synthetic air with various water vapour contents. The results obtained for Rene 80 in Ar-O$_{2}$ based atmospheres showed that water vapour addition had only a minor effect on the scale composition and growth rate. However, in the synthetic air based atmospheres water vapour addition suppressed internal Ti nitridation. After longer exposure times (over 1000 h at 1050°C) higher material loss was observed in the H2$_{O}$-containing synthetic air, which might be related to evaporation of Cr, Mo, W oxyhydroxide species. [...]

Keyword(s): Dissertation

Note: RWTH Aachen, Diss., 2014

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Contributing Institute(s):

1. Werkstoffstruktur und -eigenschaften (IEK-2)

Research Program(s):

1. 122 - Power Plants (POF2-122) (POF2-122)

Appears in the scientific report 2014

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Database coverage:

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